At what cycle day do you usually ovulate?

Lisa
Hi ladies,
I miscarried July 6th, and have been busy TTC since. I used OPKs in June before conceiving and found that I got my first positive at CD 17. My cycles hadn't been normal since I stopped birth control in January. After I miscarried, I received a positive opk 22 days after my miscarriage.
I'm on CD 15 this cycle which is the cycle that I got my first AF since the miscarriage. I'm just curious at what point in other women's cycles they've gotten a positive opk. I know that CD 14 for the fertility window/ovulation is the average, but not necessarily the norm. 
Thanks!